#include <iostream>
#include <string>

using namespace std;

int main()
{
    int c = 0;
    string s = "()()(()";
    string st = "";
    for (char i: s){
      if (i == '(') st = st + i;
      else
        if (st[st.length()-1] == '(') st.pop_back();
    }

if (st.length() == 0)
    cout << "true";
else cout << "false";

}








